update serial read_line

alarmdecoder/devices/serial_device.py

@@ -229,7 +229,7 @@ class SerialDevice(Device):
                 buf = filter_ad2prot_byte(self._device.read(1))
 
                 if buf != b'':
-                    self._buffer +=  buf[0]
+                    self._buffer += buf
 
                     if buf == b"\n":
                         self._buffer = self._buffer.rstrip(b"\r\n")

alarmdecoder/util.py

@@ -97,14 +97,14 @@ def filter_ad2prot_byte(buf):
     """
     Return the byte sent in back if valid visible terminal characters or line terminators.
     """
-    c = buf[0];
+    c = buf[0]
 
-    if (c == '\n' or c == '\r'):
-        return c
+    if (c == 10 or c == 13):
+        return buf
     if (c > 31 and c < 127):
-        return c
+        return buf
     else:
-        return ''
+        return b''
 
 def read_firmware_file(file_path):
     """